论文标题
可扩展的复合材料从过渡金属氧化物作为阴极材料中受益的复合材料，可有效锂硫电池
Scalable Composites Benefiting from Transition-Metal Oxides as Cathode Materials for Efficient Lithium-Sulfur Batteries
论文作者
论文摘要
通过在硫中包括具有不同结构和形态的过渡金属氧化物来实现的复合材料被认为是用于高能量锂硫的可伸缩阴极（Li-S）电池。该复合材料含有80 wt。％硫和20 wt。的MNO2或TIO2％，导致电极的硫含量为64 wt。％，并揭示了具有有限相间耐药性的细胞中可逆，快速和降低的极化转换过程。 S-TIO2复合材料在C/10和2C之间具有出色的速率能力，并且由于纳米TIO2添加剂在增强反应动力学方面的影响，在2C时延伸了400个周期。取而代之的是，MNO2的微米大小的颗粒部分将S-MNO2的电化学活性限制为当前1C的速率。然而，S-MNO2和S-TIO2都承受了接近6 mgcm-2的值的硫，并且在C/5时传递了大约4.5至5.5 mAhcm-2的面积电容。即使在高活性材料负载下，金属氧化物硫的电极的出色性能以及工作中采用的合成途径的可能可伸缩性表明，复合材料对于下一代LI-S电池具有高能量密度和有效的电化学过程的可行阴极。
Composite materials achieved by including transition-metal oxides with different structures and morphologies in sulfur are suggested as scalable cathodes for high-energy lithium-sulfur (Li-S) batteries. The composites contain 80 wt.% sulfur and 20 wt.% of either MnO2 or TiO2, leading to a sulfur content in the electrode of 64 wt.% and revealing a reversible, fast, and lowly polarized conversion process in the cell with limited interphase resistance. The S-TiO2 composite exhibits an excellent rate capability between C/10 and 2C, and a cycle life extended over 400 cycles at 2C, owing to the effects of the nanometric TiO2 additive in boosting the reaction kinetics. Instead, the micrometric sized particles of MnO2 partially limit the electrochemical activity of S-MnO2 to the current rate of 1C. Nevertheless, both S-MnO2 and S-TiO2 withstand a sulfur loading up to values approaching 6 mgcm-2, and deliver an areal capacit ranging from about 4.5 to 5.5 mAhcm-2 at C/5. The excellent performances of the metal oxide-sulfur electrodes, even at high active material loading, and the possible scalability of the synthetic pathway adopted in the work suggest that the composites are viable cathodes for next-generation Li-S batteries with high energy density and efficient electrochemical process.
